SELECT 
  * 
FROM 
  cscart_mb_salvage_cases 
WHERE 
  auction_product_id IN (
    20589, 20590, 20591, 20592, 20593, 20594, 
    20595, 20596, 20597, 20598, 20599, 
    20600, 20601, 20602, 20603, 20604
  ) 
  OR sale_product_id IN (
    20589, 20590, 20591, 20592, 20593, 20594, 
    20595, 20596, 20597, 20598, 20599, 
    20600, 20601, 20602, 20603, 20604
  ) 
ORDER BY 
  updated_at DESC, 
  case_id DESC

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cscart_mb_salvage_cases.updated_at desc, cscart_mb_salvage_cases.case_id desc",
        "table": {
          "table_name": "cscart_mb_salvage_cases",
          "access_type": "ALL",
          "rows": 56,
          "filtered": 100,
          "attached_condition": "cscart_mb_salvage_cases.auction_product_id in (20589,20590,20591,20592,20593,20594,20595,20596,20597,20598,20599,20600,20601,20602,20603,20604) or cscart_mb_salvage_cases.sale_product_id in (20589,20590,20591,20592,20593,20594,20595,20596,20597,20598,20599,20600,20601,20602,20603,20604)"
        }
      }
    }
  }
}